Magnetic disk-jacket assembly

• US 4,263,634 A
• Filed: 09/17/1979
• Issued: 04/21/1981
• Est. Priority Date: 09/17/1979
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Smith, Donald J., Chenoweth, Roger D.
• Primary Examiner(s): Tupper, Robert S.
• Application Number:
  US06/075,858
• Time in Patent Office: 582 Days
• Field of Search: 360/133, 360/99, 206/444
• US Class Current: 360/133
• CPC Class Codes: G11B 23/0332 for single discs, e.g. envelopes
• CPC Class Codes: G11B 23/505 of disk carriers
• CPC Class Codes: G11B 3/5827 using means contacting the record carrier

Abstract

A disk-jacket assembly including a flexible disk rotatably disposed in a square jacket having radially extending registering slots in its two thicknesses for receiving a pair of opposite transducers or alternately a single transducer in one slot and a pressure member in the other slot. Panels of porous low friction dusting fabric are disposed between the faces of the disk and the opposite inner faces of the jacket. The dusting fabric has slots coincident with the slots in the jacket, and the dusting fabric slots are wider than the jacket slots particularly for spacing the disk entry side edges of the jacket slots from the adjacent edges of the fabric to substantially prevent loose fibers on the fabric extending into the jacket slots.

Claims

1. In a magnetic record assembly including

a magnetic disk of thin flexible material;

a jacket having said magnetic disk disposed therein and having panels of a porous, low friction, dusting fabric lining positioned between and adhered to opposite, confronting faces of said jacket and covering substantially all the jacket surface confronting said magnetic disk to line said jacket for snugly encasing said disk and allowing the disk to be rotatably driven within the jacket; and

an elongated opening in said jacket and a gap in said panels having edges that register with said jacket opening so that said opening may receive a magnetic transducer in data transferring relationship with said disk;

the improvement wherein the side edge of said jacket opening and the edge at the panel gap adjacent to which increments of said disk first appear due to rotation of the disk are spaced from each other with the disk entry side edge of said fabric panel gap being positioned upstream of disk rotation with respect to the disk entry side edge of said jacket opening, whereby said disk is substantially continuously wiped by said panels while providing a space between said fabric and said jacket opening which excludes frayed or free fibers from the jacket opening.

2. A magnetic record assembly as set forth in claim 1, wherein the disk exit side edges of said jacket opening and fabric gaps, in which increments of said disk leave said openings due to rotation of the disk, being spaced from each other with the disk exit side edge of said fabric gap being positioned downstream of disk rotation with respect to the disk exit side of said jacket opening.

3. A magnetic record assembly as set forth in claim 1, said edges of said fabric extending for somewhat less than half the diameter of said disk so that the panel on the thickness of said jacket having said jacket opening therein is U-shaped.

4. A magnetic record assembly as set forth in claim 1, said disk entry side edge of said fabric opening being formed by slitting the fabric so as to reduce the number of free fabric fibers on said edge.

5. A magnetic record assembly as set forth in claim 1, wherein said fabric edges are formed by cutting to minimize the presence of free or frayed fibers and said fabric edges defining said fabric gap provide a space between the edges of constant width extending for substantially the complete diameter of said disk so as to define two separate ones of said panels lining the thickness of said jacket having said jacket opening therein, with the gap embracing said jacket opening.

6. In a magnetic record assembly including a magnetic disk of thin flexible material,

a jacket having said magnetic disk disposed therein and having panels of a porous, low friction dusting fabric positioned between the opposite faces of the magnetic disk and the confronting surfaces of the jacket to line the jacket for snugly encasing said disk and allowing the disk to be rotatably driven within the jacket as so lined with the dusting fabric,

said liner being secured to said jacket and substantially completely covering said jacket surfaces confronting the faces of said magnetic disk,

said jacket having a pair of registering openings in its confronting surfaces for receiving a transducer and an opposite pressure member or for receiving two opposite transducers, and

said fabric of said panels having edges defining a gap through the fabric on both surfaces of said jacket which are in register with said jacket openings to allow said transducers and pressure member to have contact with the disk,

the improvement wherein the disk entry side edges of said registering fabric gaps and jacket openings adjacent to which increments of said disk first appear in said openings due to rotation of the disk, being spaced from each other with the disk entry side edges of said fabric gaps being positioned upstream of disk rotation with respect to the corresponding disk entry side edges of said jacket openings.

7. A magnetic record assembly as set forth in claim 6, said panels of dusting fabric being formed by two spaced strips of dusting fabric and from one jacket thickness onto the other jacket thickness.